This is an external module. Please note that it may or may not work with the current release (1.6.6).This module is not included in the default ZNC installation, and you will need to manually compile it before you can load this module.Contact the author if you have any questions, but feel free to ask on #znc (chat.freenode.net). Someone might be able to help you there.

This module will notify you of CTCP requests you receive.

This is especially useful when you have custom CTCP responses set up with ZNC, as ZNC will not pass these requests through to your client.
So you will never be aware of the fact that somebody sent you a CTCP request.